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Reciprocatory fluid pumpReciprocatory fluid pump description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20080050251, Reciprocatory fluid pump. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD AND BACKGROUND OF THE INVENTION [0001]The present invention relates to reciprocatory fluid pumps, and particularly to electromagnetic reciprocatory pumps widely used for low-pressure applications. [0002]A large number of reciprocatory fluid pumps have been developed for low-pressure applications. They generally include a housing; an electromagnet fixed within the housing and defining an air gap; an armature assembly, sometimes called a plunger assembly or actuator, extending through the air gap and magnetically coupled to the electromagnet so as to be reciprocated thereby during the energization of the electromagnet; a pumping member, such as a diaphragm or a piston, mechanically coupled to the armature assembly so as to be reciprocated thereby; and a valve assembly cooperable with the pumping member, the valve assembly having an inlet port through which fluid is inletted and an outlet port through which fluid is outletted upon the reciprocation of the pumping member. [0003]The known reciprocatory fluid pumps of this type generally include two pumping members, e.g., diaphragms, at its opposite ends, driven by two electromagnets. Other designs have been proposed including a single electromagnet driving two pumping members, e.g. diaphragms. Examples of such prior art pumps are described in U.S. Pat. Nos. 4,859,152 and 4,154,559. [0004]The known reciprocatory fluid pumps of this type, however, are generally bulky, heavy and relatively expensive. In addition, the known reciprocatory fluid pumps generate considerable sound and vibration, as compared to rotary fluid pumps. OBJECT AND BRIEF SUMMARY OF THE PRESENT INVENTION [0005]An object of the present invention is to provide a reciprocatory fluid pump having advantages in one or more of the above respects. [0006]According to one aspect of the present invention, there is provided a reciprocatory fluid pump comprising a housing; an electromagnetic fixed within the housing and defining an air gap; and armature assembly extending through the air gap and magnetically coupled to the electromagnet so as to be reciprocated thereby during the energization thereof; a pumping member mechanically coupled to the armature assembly so as to be reciprocated thereby; and a valve assembly cooperable with the pumping member, the valve assembly having an inlet port through which fluid is inletted, and an outlet port through which fluid is outletted upon the reciprocation of the pumping member; characterized in that the armature assembly is reciprocatably mounted to the housing by a pair of spaced leaf springs extending parallel to each other and fixed at their opposite ends to the armature assembly and housing, respectively, so as to define therewith a four-sided parallelogram in which the pair of leaf springs serve as two parallel sides, and the armature assembly and housing, respectively, serve as the other two parallel sides. [0007]According to a particularly important feature in the preferred embodiments of the invention described below, the leaf springs are of flat rectangular configuration constraining the reciprocatory movement of the armature assembly to longitudinal displacement with a small transverse displacement. [0008]As will be described more particularly below, reciprocatory fluid pumps can be constructed in accordance with the foregoing features having a high degree of efficiency and a relatively compact construction which can be produced in volume and at relatively low cost. [0009]According to a feature in the described preferred embodiments, the housing includes a base, and the pair of leaf springs are secured at one of their ends to the base such as to reduce sounds and vibrations during the operation of the pump. [0010]Several embodiments of the invention are described below for purposes of example. In one embodiment, the pumping member is a diaphragm; in a second embodiment, the pumping member is a piston; and in a third embodiment, a pumping member and a valve assembly are provided at each of the opposite ends of the pump. [0011]Further features and advantages of the invention will be apparent from the description below. BRIEF DESCRIPTION OF THE DRAWINGS [0012]The invention is herein described, by way of example only, with reference to the accompanying drawings, wherein: [0013]FIG. 1 is a three-dimensional view illustrating one form of reciprocatory fluid pump constructed in accordance with the present invention; [0014]FIG. 2 is a longitudinal sectional view of the pump of FIG. 1; [0015]FIG. 3 illustrates one of the two leaf springs for mounting the armature assembly in the pump of FIG. 1; [0016]FIG. 4 is a longitudinal sectional view illustrating a two-diaphragm pump constructed in accordance with the present invention; [0017]and FIG. 5 is a longitudinal sectional view illustrating a piston pump constructed in accordance with the present invention. [0018]It is to be understood that the foregoing drawings, and the description below, are provided primarily for purposes of facilitating understanding the conceptual aspects of the invention and possible embodiments thereof, including what is presently considered to be a preferred embodiment. In the interest of clarity and brevity, no attempt is made to provide more details than necessary to enable one skilled in the art, using routine skill and design, to understand and practice the described invention. It is to be further understood that the embodiments described are for purposes of example only, and that the invention is capable of being embodied in other forms and applications than described herein. DESCRIPTION OF PREFERRED EMBODIMENTS The Embodiment of FIGS. 1-3 [0019]As shown in FIGS. 1 and 2, the reciprocatory fluid pump of this embodiment includes a housing, generally designated 10, comprising a base 11, and two side walls 12, 13 extending upwardly from the base and perpendicularly to it and to each other. An electromagnet 14 including a coil 15 is mounted in the upper end of housing 10 by a pair of bolts 16, 17 passing therethrough and through sidewall 12, such that the lower end of the electromagnet defines an air gap 18. One side of base 11 is formed with a recess 19 (FIG. 1) for use in mounting an armature assembly, generally designated 20. Armature assembly 20 which extends through air gap 18 and is magnetically coupled to the electromagnet 14 so as to be reciprocated thereby during the energization of the electromagnet. Continue reading about Reciprocatory fluid pump... Full patent description for Reciprocatory fluid pump Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Reciprocatory fluid pump patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Reciprocatory fluid pump or other areas of interest. ### Previous Patent Application: Air supply system with reduced oil passing in compressor Next Patent Application: Bearing housing, and motor assembly and vacuum cleaner having the same Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Reciprocatory fluid pump patent info. 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